Low-loss and low profile metamateriallens antenna for 5G millimeter wave

A novel wideband, low loss and full phase adjustable metamaterial unit is proposed in this paper. The simple structure can reduce the simulation time and the antenna production cost. The metamaterial unit consists of only two fork elements on both surfaces of a piece of thin dielectric substrate. Its transmission phase coverage is over
$360^{\circ}$
, reflection coefficient is better than - 10dB and transmission coefficient is better than -0.5dB. A lens antenna with capability of beam scanning for 5G millimeter-wave application is designed based on this unit. The lens can fully cover 5G spectrum from 24.25 to 27.5GHz, the peak gain of which can achieve 20.45dBi at 26GHz with 9dB higher than the feed antenna. The simulated results show that a scanning coverage of
$\pm 30^{\circ}$
in the horizontal plane can be realized by adding equal phase difference to the four ports of the feed antenna array.